Cutting device



Nov. 8, 1.932. J. MlERlTz 1,887,154

CUTTING DEVICE Filed Deo. 5, 1950 2 Sheets-Sheet 1 Nov. 8, 1932. J, MlERn-z 1,887,164

CUTTING nEvIcE Filed Dec. 5. 1930 2 sheets-Sheen 2 Patented Nov. 1932 UNITED 4STATI-:s

JOHANNES MIEBIITZ, OF BERLIN, GERMANY comme DEVICE Application led Decemer 5, 1930, Serial No. 500,358, and in Germany July 3, 1929.

This invention relates to a cutting device, which is intended first of all for the working of plates of wood, paste-board', sheet-metal, paper, and the like, and the arrangement and combination of its parts is such that not solel the outer edges of said plates can be Worke but also recesses and cut-outs of any desired shape can be produced in the face thereof. According to the invention the knife reciprocates like a ram and is driven by a motor firmly connected with the frame of the device, the framehaving a base shiftable upon the plate to be provided with the cuts.

Preferably the armature of the motor which is an electric lmotor is immovably supported in the frame of the cutting device, whereas the stator of the motor that is combined with the magnet frame is rotatory and is connected with the reciprocating knife by suitable means, for instance and preferably by an eccentric drive. I attain by this arrangement that the mass of the combined stator and magnet frame acts as a fiy mass, similar to a fly wheel, whereby unsteady 0peration of the knife is prevented. Without employment of a fly-mass the knife operates unsteadily because there is a considerable difference in the performance of the device beknife and the upward or idle stroke thereof.

the respective plate face.

The invention is illustrated diagrammatically'and by way of example on the accompanying drawings on which Figure 1 is a sideview of a cutting device designed according to this mventlon; Figure 2 1s a plan thereof;

Figure 3 is a separate side-view solely of the tween the downward or working stroke of the casing enclosing the electromotor and of the means for guidingthe ram knife, these means being shown in section; Figure 4 is a longitudinal section through the parts shown in Fig. 3, the plane of section standing at right angles with respect to the plane of the paper ofthe drawings; Figure 5 is a front-view of another constructional form of the device, Figure 6 is a side-view thereof, and Figure 7 is a view similar to Fig. 5, showing certain parts in another position, these figures (5 7) being drawn to a reduced scale relatively to Figs. 1-4; Figure 8 is a side-view of another modification, Figure 9 is a front-view of still another modification, Figure 10 is a View similar to Fig. 3 and pertaining to this last modification, and Figure 11 is a plan of the base plate also of this modification, all as fully described hereinafter.

Referring to the first constructional form shown in Figs. 1-4, l denotes two vertical spaced semi-circular guide members firmly connected with brackets 3 affixed to an annular base 3. The members 1 are connected with said brackets 8a by the intermediary of short transverse members 1'* from which extend forth lateral grips 17, with the aid of which the entire device can be shifted in any direction upon the plate to be provided with the cut-outs or the like, as is more fully dealt with hereinafter.

The semi-circular members 1 serve as supports for a casing 4 in which are housed the stator 6 and the armature 5 of an electromotor; these parts 5 and 6 are supported by an axle 5, and the arrangement is such that the stator which is combined with the magnet frame is turnable whereas the armature is stationary. The rotatory stator is connected with an eccentric'disc 7 which is encompassed by an eccentric ring 8, and from this ring extends downwardly a rod 9, to the free end of which the ram knife 11 is detachably attached. This rod is guided by a sleeve 10 extending forth from the casing 4.

The bottom face of the casing 4 is provided with shoulder-forming projections 12 which rest, and can slide along, upon the semi-circular members 1, and can be firmly connected therewith in any position of the casing 4 upon 'an aperture 16 provided in a them by means of clamping cheeks 13 and screws 14. The radius of the semicircle constituted by the members 1 corresponds to the distance between the working edge of the ram knife 11 and the bottom faces of the shoulders 12. Said working edge is located just over transparent plate 15 consisting, for instance, of celluloid or cellon or the like and being firmly connected with the basering 3. Whichever the position of the casing 4vwith the electromotor and the parts 9, and 11 upon or at the semifcircular members 1 may be, that is to say, perfectly independent of whether the ram knife stands vertically with respect to f the plate or forms any angle therewith,

the working edge of the knife lies at any rate centrally over the opening 16.

The manner of operation of the device is as follows:

First of all the knife is adjusted over the plate 15 and its aperture 16 correspondingr to the cuts to be produced, viz. whether they are to be vertical or oblique (faceted cuts). Then the casing 4 is secured in its position upon and at the semi-circular members 1. When now the current is switched on, the rotatory stator of the electromotor will rotate (the armature being stationary, as has al ready been described) and the knife will now be reciprocated by the eccentric members 7 and 8. Finally, the entire device is shifted upon the plate to be provided with the cuts,

l that plate having prior thereto been provided with lines indicating the cut-outs or recesses etc. to be produced, the device being so moved that the cutting edge of the knife passes along the respective line or lines which may be straight or curved in any way. The device is shifted upon the plate with the aid of the grips 17 which are provided for this purpose, as has already been mentioned at a preceding part of this specification. Owing to the provision of the transparent plate 16 the operator can distinctly see the line or lines to be followed, and the particles cut or severed off from the respective material are prevented from jumping upwardly and hindering the work.

As the stator of the motor with the magnet frame acts as afly-mass, as already stated, the knife operates very uniformly which is very advantageous `for the quality of the product and for guiding the apparatus.

In the modification illustrated in Figs. 5-7, 18 denotes a standard secured to a U-shaped base plate 19, the legs of which are provided with grips 2O located at the ends of the legs and serving for moving the device, along upon the plate to be worked. The upper end of the standard 18 is curved in the direction to said grips and in it is supported a horizontal axle 22, one end of which is firmly connected with the casing 21 in which the motor is housed. The casing 21 can be turned togeththe device is shown in a position in which vertical cut-outs will be produced. The knife is located over the space between the two legs of the U-shaped base plate. If faceted cut-outs are to be made, the screw 23 is loosened and the casing 21 thenturned to the desired angle, as, for instance, inFig. 7, and for the knife rod 24 is substituted another knife rod 24'1 of greater length than rod 24 so that the ram knife can act on the plate upon which the device has been placed. The manner of operation is the same as with the first-described constructional form, and also in this case a transparent plate may be attached to the base of the device and a slot will then be provided in said plate through which the knife can act upon the plate to be worked. In the position shown in Fig. 7, the casing with the knife has been turned laterally so much that the knife works outside the base plate, the facets produced being, of course, correspondingly inclined.

In the further modification shown in Fig. 8 the casing 26 with its guide-sleeve 26a and the rod 28 with the knife 27 are firmly connected with an arm 29 which is hinged at 31 to the base plate 30 from which extends upwardly a quadrant 32 that is provided with a scale along which t-he casing with the said other members can be adjusted andcan be secured in the adjusted position by suitable 'means The manner of operation of this constructional form is the same as with the other constructional forms described in the preceding pages, and cut-outs or the like with vertical, as well as with inclined or faceted edges can be produced.

Finally I have shown in Figs. 9-11 a constructional form intended solely for vertical cuts. The casing enclosing the electromotor is practically the same as that in Figs. 1-4 and the same letters of reference as in those figures have been used also in Fig. 10 in so far as said casing etc. are concerned. The casing issupported on two vertical standards 33 projecting forth from a U-shaped base plate 34. This plate is shown separately in Fig. 11 which is a horizontal section in the plane XI'XI of Fig. 9. It lwill be obvious that also in this constructional form, as well as in all other ones, the device works very uniformly and free from oscillations and shocks, as the rotary magnet frame acts as fly-mass, just as has fully been described With respect to Figs. 1j4.

-I wish it' to be understood that I do not limit myself solely to the details of the various constructional forms of the cutting device or merely to these constructional forms which'have been shown and described solely by way of example. Many departures in the details are possible without departing from the gist of thel invention. Thus, for instance, a crank drive may be substituted for the eccentric drive for the knife.

I claim:

1. A cutting device, comprising, in combination with a frame; an electromotor 1ocated in said frame and comprising a stationary armature and a rotary stator; a reciprocable rod; a ram knife at the free end of said rod and means for converting the rotary motion of said stator into reciprocating motion and for transmitting this motion to the said rod and knife.

2. A cutting device, comprising, in combination with a frame; an electromotor located in said frame and comprising a stationary armature and a rotary stator; a reciprocable rod; a ram knife at the f-ree end of said rod; an eccentric disk connected with said stator, and an eccentric ring encompassing said disk and being connected with said rod so as to convert the rotary motion of the said stator into reciprocating motion and to transmit this latter to the said rod and knife.

3. A cutting device, comprising, in combination with a frame; a casing supported by the same and being so attached to it that it can be adjusted to various angular positions; an electromotor located in said casing and comprising a stationary armature and a rotary stator; a reciprocable rod attached t0 said casing; a ram knife at the free end of said rod; and means for converting the r0- tary motion of said stator into reciprocating motion and -for transmitting this motion to the said rod and knife. 4. A cutting device, comprising, in combination, a vertical semi-circular frame; a reciprocable rod being so attached to said frame as to be adapted tobe adjusted along it to various angular positions; a ram knife attached to the free end of said rod; and means for reciprocating this latter with its knife.

5. A cutting device, comprising, in combination, a vertical semi-circular frame; an annular base plate to which said frame is affixed; a reciprocable rod being so attached to said frame as to be adapted to be adjusted along it to various angular positions; a ram knife attached to the free end of said rod; and means for reciprocating this latter with its knife.

6. A cutting device, comprising, in combination, a vertical semi-circular frame; an

annular base plate to which said frame is af- `fixed; a transparent plate closing the free space of said base plate and having a central aperture; a reciprocable rod being so attached to said frame as to be adapted to be adjusted along it to various angular positions; a ram knife attached to the free end of said rod; and means for reciprocating this latter with its knife. i

7 A cutting device, comprising, in combination, an upwardly extending arm adapted to be turned into various angular positions and to be fixed in every one thereof; a casing connectedv with said arm; an electromotor arranged in said casing; a reciprocable rod attached to said casing a ram knife attached to the free end of said rod; and means for converting the rotary motion of said stator into reciprocating motion and for transmitting this motion to the said rod and knife.

8. A cutting device, comprising in combination, an upwardly extending arm adapt- `ed to be turned into various angular positions and to be fixed in every one thereof; a circularly curved guide member for said arm; a casing connected with said arm; an electromotor arranged in said casing; a reciprocable rod attached to said casing; a ram knife attached to the free end of said rod; and means for converting the rotary motion of said motor into reciprocating motion and for transmitting this motion to the said rod and knife.

9. A cutting device, comprising, in combination a frame; a reciprocable rod extendi ing forth from the same; a ram knife attached to the free end of said rod; and means for reciprocating the said rod with its knife; a base plate carrying said frame and having a recess, a transparent plate closing said recess and having an aperture through which said knife is moved.

In testimony whereof I aiiix my signature.

JOHANNES MIERITZ. 

